/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets;

import Entities.Resource;
import Entities.Resourcecategory;
import helpers.Debug;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import rhserver.MainController;

/**
 *
 * @author Bari
 */
public class ResourceServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        EntityManager em = MainController.getInstance().getEntityManager();
        try {
            String id = request.getParameter("id");
            if (id != null) {
                Debug.logMessage("delete category", "id: " + id);
                long categoryId = Long.parseLong(id);
                TypedQuery<Resource> query = em.createNamedQuery("Resource.findById", Resource.class);
                query.setParameter("id", categoryId);
                List<Resource> resource = query.getResultList();
                if (resource.size() > 0) {
                    em.getTransaction().begin();
                    em.remove(resource.get(0));
                    em.getTransaction().commit();
                }
            }

            String name = request.getParameter("name");
            String categoryid = request.getParameter("categoryid");
            String description = request.getParameter("description");
            String telNumber = request.getParameter("telnumber");
            Debug.logMessage("add resource", "category id: " + categoryid);
            if (name != null && categoryid != null && description != null && telNumber != null) {//add new ResourceCategory
                if (!name.equals("") && !telNumber.equals("")) {
                    Resourcecategory category = getCategoryAfterID(categoryid, em);
                    if (category != null) {
                        Resource resource = new Resource();
                        resource.setName(name);
                        resource.setDescription(description);
                        resource.setTelnumber(telNumber);
                        resource.setCategory(category);
                        em.getTransaction().begin();
                        em.persist(resource);
                        em.getTransaction().commit();
                    }
                }
            }

            TypedQuery<Resource> query = em.createNamedQuery("Resource.findAll", Resource.class);
            List<Resource> resources = query.getResultList();

            TypedQuery<Resourcecategory> queryC = em.createNamedQuery("Resourcecategory.findAll", Resourcecategory.class);
            List<Resourcecategory> categories = queryC.getResultList();
            request.setAttribute("resources", resources);
            request.setAttribute("categories", categories);
            request.getRequestDispatcher("/listresources.jsp").forward(request, response);

        } finally {
            // Close the database connection:
            if (em.getTransaction().isActive()) {
                em.getTransaction().rollback();
            }
            em.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    private Resourcecategory getCategoryAfterID(String sid, EntityManager em) {
        long categoryId = Long.parseLong(sid);
        TypedQuery<Resourcecategory> query = em.createNamedQuery("Resourcecategory.findById", Resourcecategory.class);
        query.setParameter("id", categoryId);
        List<Resourcecategory> categories = query.getResultList();
        if (categories.size() > 0) {
            return categories.get(0);
        } else {
            return null;
        }
    }
}
